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Summary of common JavaScript methods

高洛峰

Feb 04, 2017 pm 05:01 PM

javascript

经常使用的 JS 方法，今天记下，以便以后查询

/* 手机类型判断 */
var BrowserInfo = {
userAgent: navigator.userAgent.toLowerCase()
isAndroid: Boolean(navigator.userAgent.match(/android/ig)),
isIphone: Boolean(navigator.userAgent.match(/iphone|ipod/ig)),
isIpad: Boolean(navigator.userAgent.match(/ipad/ig)),
isWeixin: Boolean(navigator.userAgent.match(/MicroMessenger/ig)),
}

/* 返回字符串长度，汉子计数为2 */

function strLength(str) {
var a = 0;
for (var i = 0; i < str.length; i++) {
if (str.charCodeAt(i) > 255)
a += 2;//按照预期计数增加2
else
a++;
}
return a;
}

获取url中的参数

function GetQueryStringRegExp(name,url) {
var reg = new RegExp("(^|\\?|&)" + name + "=([^&]*)(\\s|&|$)", "i");
if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/\+/g, " ")); return "";
}

/* js 绑定事件适用于任何浏览器的元素绑定 */

function eventBind(obj, eventType, callBack) {
if (obj.addEventListener) {
obj.addEventListener(eventType, callBack, false);
}
else if (window.attachEvent) {
obj.attachEvent(&#39;on&#39; + eventType, callBack);
}
else {
obj[&#39;on&#39; + eventType] = callBack;
}
};
eventBind(document, &#39;click&#39;, bodyClick);

/* 获得当前浏览器JS的版本 */

function getjsversion(){
var n = navigator;
var u = n.userAgent;
var apn = n.appName;
var v = n.appVersion;
var ie = v.indexOf(&#39;MSIE &#39;);
if (ie > 0){
apv = parseInt(i = v.substring(ie + 5));
if (apv > 3) {
apv = parseFloat(i);
}
} else {
apv = parseFloat(v);
}
var isie = (apn == &#39;Microsoft Internet Explorer&#39;);
var ismac = (u.indexOf(&#39;Mac&#39;) >= 0);
var javascriptVersion = "1.0";
if (String && String.prototype) {
javascriptVersion = &#39;1.1&#39;;
if (javascriptVersion.match) {
javascriptVersion = &#39;1.2&#39;;
var tm = new Date;
if (tm.setUTCDate) {
javascriptVersion = &#39;1.3&#39;;
if (isie && ismac && apv >= 5) javascriptVersion = &#39;1.4&#39;;
var pn = 0;
if (pn.toPrecision) {
javascriptVersion = &#39;1.5&#39;;
a = new Array;
if (a.forEach) {
javascriptVersion = &#39;1.6&#39;;
i = 0;
o = new Object;
tcf = new Function(&#39;o&#39;, &#39;var e,i=0;try{i=new Iterator(o)}catch(e){}return i&#39;);
i = tcf(o);
if (i && i.next) {
javascriptVersion = &#39;1.7&#39;;
}
}
}
}
}
}
return javascriptVersion;
}

/* 获取当前点击事件的Object对象 */

function getEvent() {
if (document.all) {
return window.event; //如果是ie
}
func = getEvent.caller;
while (func != null) {
var arg0 = func.arguments[0];
if (arg0) {
if ((arg0.constructor == Event || arg0.constructor == MouseEvent)
|| (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
return arg0;
}
}
func = func.caller;
}
return null;
};

/* 字符串截取方法 */

getCharactersLen: function (charStr, cutCount) {
if (charStr == null || charStr == &#39;&#39;) return &#39;&#39;;
var totalCount = 0;
var newStr = &#39;&#39;;
for (var i = 0; i < charStr.length; i++) {
var c = charStr.charCodeAt(i);
if (c < 255 && c > 0) {
totalCount++;
} else {
totalCount += 2;
}
if (totalCount >= cutCount) {
newStr += charStr.charAt(i);
break;
}
else {
newStr += charStr.charAt(i);
}
}
return newStr;
}

/* JS 弹出新窗口全屏 */

var tmp = window.open("about:blank", "", "fullscreen=1")
tmp.moveTo(0, 0);
tmp.resizeTo(screen.width + 20, screen.height);
tmp.focus();
tmp.location.href = &#39;http://www.che168.com/pinggu/eva_&#39; + msgResult.message[0] + &#39;.html&#39;;

var config_ = "left=0,top=0,width=" + (window.screen.Width) + ",height=" + (window.screen.Height);
window.open(&#39;http://www.che168.com/pinggu/eva_&#39; + msgResult.message[0] + &#39;.html&#39;, "winHanle", config_);
//模拟form提交打开新页面
var f = document.createElement("form");
f.setAttribute(&#39;action&#39;, &#39;http://www.che168.com/pinggu/eva_&#39; + msgResult.message[0] + &#39;.html&#39;);
f.target = &#39;_blank&#39;;
document.body.appendChild(f);
f.submit();

/* 全选/全不选 */

function selectAll(objSelect) {
if (objSelect.checked == true) {
$("input[name=&#39;chkId&#39;]").attr("checked", true);
$("input[name=&#39;chkAll&#39;]").attr("checked", true);
}
else if (objSelect.checked == false) {
$("input[name=&#39;chkId&#39;]").attr("checked", false);
$("input[name=&#39;chkAll&#39;]").attr("checked", false);
}
}

/* js 判断浏览器 */

判断是否是 IE 浏览器
if (document.all){
alert(”IE浏览器”);
}else{
alert(”非IE浏览器”);
}
if (!!window.ActiveXObject){
alert(”IE浏览器”);
}else{
alert(”非IE浏览器”);
}
判断是IE几
var isIE=!!window.ActiveXObject;
var isIE6=isIE&&!window.XMLHttpRequest;
var isIE8=isIE&&!!document.documentMode;
var isIE7=isIE&&!isIE6&&!isIE8;
if (isIE){
if (isIE6){
alert(”ie6″);
}else if (isIE8){
alert(”ie8″);
}else if (isIE7){
alert(”ie7″);
}
}

/* 判断浏览器 */

function getOs() {
if (navigator.userAgent.indexOf("MSIE 8.0") > 0) {
return "MSIE8";
}
else if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {
return "MSIE6";
}
else if (navigator.userAgent.indexOf("MSIE 7.0") > 0) {
return "MSIE7";
}
else if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) {
return "Firefox";
}
if (navigator.userAgent.indexOf("Chrome") > 0) {
return "Chrome";
}
else {
return "Other";
}
}

/* JS判断两个日期大小适合 2012-09-09 与2012-9-9 两种格式的对比 */

//得到日期值并转化成日期格式，replace(/\-/g, "\/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了
function ValidateDate() {
var beginDate = $("#t_datestart").val();
var endDate = $("#t_dateend").val();
if (beginDate.length > 0 && endDate.length>0) {
var sDate = new Date(beginDate.replace(/\-/g, "\/"));
var eDate= new Date(endDate.replace(/\-/g, "\/"));
if (sDate > eDate) {
alert(&#39;开始日期要小于结束日期&#39;);
return false;
}
}
}

/* 移除事件 */

this.moveBind = function (objId, eventType, callBack) {
var obj = document.getElementById(objId);
if (obj.removeEventListener) {
obj.removeEventListener(eventType, callBack, false);
}
else if (window.detachEvent) {
obj.detachEvent(&#39;on&#39; + eventType, callBack);
}
else {
obj[&#39;on&#39; + eventType] = null;
}
}

/* 回车提交 */

$("id").onkeypress = function (event) {
event = (event) ? event : ((window.event) ? window.event : "")
keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);
if (keyCode == 13) {
$("SubmitLogin").onclick();
}
}

/* JS 执行计时器 */

timeStart = new Date().getTime();
timesEnd = new Date().getTime();
document.getElementById("time").innerHTML = timesEnd - timeStart;

/* JS 写Cookie */

function setCookie(name, value, expires, path, domain) {
if (!expires) expires = -1;
if (!path) path = "/";
var d = "" + name + "=" + value;
var e;
if (expires < 0) {
e = "";
}
else if (expires == 0) {
var f = new Date(1970, 1, 1);
e = ";expires=" + f.toUTCString();
}
else {
var now = new Date();
var f = new Date(now.getTime() + expires * 1000);
e = ";expires=" + f.toUTCString();
}
var dm;
if (!domain) {
dm = "";
}
else {
dm = ";domain=" + domain;
}
document.cookie = name + "=" + value + ";path=" + path + e + dm;
};

/* JS 读Cookie */

function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(&#39;;&#39;);
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == &#39; &#39;) c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) {
return decodeURIComponent(c.substring(nameEQ.length, c.length))
}
} return null
}

/* Ajax 请求 */

C.ajax = function (args) {
var self = this;
this.options = {
type: &#39;GET&#39;,
async: true,
contentType: &#39;application/x-www-form-urlencoded&#39;,
url: &#39;about:blank&#39;,
data: null,
success: {},
error: {}
};
this.getXmlHttp = function () {
var xmlHttp;
try {
xmlhttp = new XMLHttpRequest();
}
catch (e) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
if (!xmlhttp) {
alert(&#39;您的浏览器不支持AJAX&#39;);
return false;
}
return xmlhttp;
};
this.send = function () {
C.each(self.options, function (key, val) {
self.options[key] = (args[key] == null) ? val : args[key];
});

var xmlHttp = new self.getXmlHttp();
if (self.options.type.toUpperCase() == &#39;GET&#39;) {
xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.test(self.options.url) ? &#39;&&#39; : &#39;?&#39;) + self.options.data)), self.options.async);
}
else {
xmlHttp.open(self.options.type, self.options.url, self.options.async);
xmlHttp.setRequestHeader(&#39;Content-Length&#39;, self.options.data.length);
}
xmlHttp.setRequestHeader(&#39;Content-Type&#39;, self.options.contentType);
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200 || xmlHttp.status == 0) {
if (typeof self.options.success == &#39;function&#39;) self.options.success(xmlHttp.responseText);
xmlHttp = null;
}
else {
if (typeof self.options.error == &#39;function&#39;) self.options.error(&#39;Server Status: &#39; + xmlHttp.status);
}
}
};

xmlHttp.send(self.options.type.toUpperCase() == &#39;POST&#39; ? self.options.data.toString() : null);
};
this.send();
};

/* JS StringBuilder 用法 */

function StringBuilder() {
this.strings = new Array;
};
StringBuilder.prototype.append = function (str) {
this.strings.push(str);
};
StringBuilder.prototype.toString = function () {
return this.strings.join(&#39;&#39;);
};

/* JS 加载到顶部LoadJS */

function loadJS (url, fn) {
var ss = document.getElementsByName(&#39;script&#39;),
loaded = false;
for (var i = 0, len = ss.length; i < len; i++) {
if (ss[i].src && ss[i].getAttribute(&#39;src&#39;) == url) {
loaded = true;
break;
}
}
if (loaded) {
if (fn && typeof fn != &#39;undefined&#39; && fn instanceof Function) fn();
return false;
}
var s = document.createElement(&#39;script&#39;),
b = false;
s.setAttribute(&#39;type&#39;, &#39;text/javascript&#39;);
s.setAttribute(&#39;src&#39;, url);
s.onload = s.onreadystatechange = function () {
if (!b && (!this.readyState || this.readyState == &#39;loaded&#39; || this.readyState == &#39;complete&#39;)) {
b = true;
if (fn && typeof fn != &#39;undefined&#39; && fn instanceof Function) fn();
}
};
document.getElementsByTagName(&#39;head&#39;)[0].appendChild(s);
},
bind: function (objId, eventType, callBack) { //适用于任何浏览器的绑定
var obj = document.getElementById(objId);
if (obj.addEventListener) {
obj.addEventListener(eventType, callBack, false);
}
else if (window.attachEvent) {
obj.attachEvent(&#39;on&#39; + eventType, callBack);
}
else {
obj[&#39;on&#39; + eventType] = callBack;
}
}

function JSLoad (args) {
s = document.createElement("script");
s.setAttribute("type", "text/javascript");
s.setAttribute("src", args.url);
s.onload = s.onreadystatechange = function () {
if (!s.readyState || s.readyState == "loaded" || s.readyState == "complete") {
if (typeof args.callback == "function") args.callback(this, args);
s.onload = s.onreadystatechange = null;
try {
s.parentNode && s.parentNode.removeChild(s);
} catch (e) { }
}
};
document.getElementsByTagName("head")[0].appendChild(s);
}

/* 清空 LoadJS 加载到顶部的js引用 */

function ClearHeadJs (src) {
var js = document.getElementsByTagName(&#39;head&#39;)[0].children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js[i].tagName.toLowerCase() == "script" && js[i].attributes[&#39;src&#39;].value.indexOf(src) > 0) {
obj = js[i];
}
}
document.getElementsByTagName(&#39;head&#39;)[0].removeChild(obj);
};

/* JS 替换非法字符主要用在密码验证上出现的特殊字符 */

function URLencode(sStr) {
return escape(sStr).replace(/\+/g, &#39;%2B&#39;).replace(/\"/g, &#39;%22&#39;).replace(/\&#39;/g, &#39;%27&#39;).replace(/\//g, &#39;%2F&#39;);
};

/* 按Ctrl + Entert 直接提交表单 */

document.body.onkeydown = function (evt) {
evt = evt ? evt : (window.event ? window.event : null);
if (13 == evt.keyCode && evt.ctrlKey) {
evt.returnValue = false;
evt.cancel = true;
PostData();
}
};

/* 获取当前时间 */

function GetCurrentDate() {
var d = new Date();
var y = d.getYear()+1900;
month = add_zero(d.getMonth() + 1),
days = add_zero(d.getDate()),
hours = add_zero(d.getHours());
minutes = add_zero(d.getMinutes()),
seconds = add_zero(d.getSeconds());
var str = y + &#39;-&#39; + month + &#39;-&#39; + days + &#39; &#39; + hours + &#39;:&#39; + minutes + &#39;:&#39; + seconds;
return str;
};
function add_zero(temp) {
if (temp < 10) return "0" + temp;
else return temp;
}

/* Js 去掉空格方法： */

String.prototype.Trim = function()
{ return this.replace(/(^\s*)|(\s*$)/g, ""); }
String.prototype.LTrim = function()
{return this.replace(/(^\s*)/g, "");}
String.prototype.RTrim = function()
{return this.replace(/(\s*$)/g, "");}

/* js 动态移除 head 里的 js 引用 */

this.ClearHeadJs = function (src) {
var js = document.getElementsByTagName(&#39;head&#39;)[0].children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js[i].tagName.toLowerCase() == "script" && js[i].attributes[&#39;src&#39;].value.indexOf(src) > 0) {
obj = js[i];
}
}
document.getElementsByTagName(&#39;head&#39;)[0].removeChild(obj);
};

/* 整个UL 点击事件加在UL里的onclick里 */

function CreateFrom(url, params) {
var f = document.createElement("form");
f.setAttribute("action", url);
for (var i = 0; i < params.length; i++) {
var input = document.createElement("input");
input.setAttribute("type", "hidden");
input.setAttribute("name", params[i].paramName);
input.setAttribute("value", params[i].paramValue);
f.appendChild(input);
}
f.target = "_blank";
document.body.appendChild(f);
f.submit();
};

/* 判断浏览器使用的是哪个 JS 版本 */

<script language="javascript">
var jsversion = 1.0;
</script>
<script language="javascript1.1">
jsversion = 1.1;
</script>
<script language="javascript1.2">
jsversion = 1.2;
</script>
<script language="javascript1.3">
jsversion = 1.3;
</script>
<script language="javascript1.4">
jsversion = 1.4;
</script>
<script language="javascript1.5">
jsversion = 1.5;
</script>
<script language="javascript1.6">
jsversion = 1.6;
</script>
<script language="javascript1.7">
jsversion = 1.7;
</script>
<script language="javascript1.8">
jsversion = 1.8;
</script>
<script language="javascript1.9">
jsversion = 1.9;
</script>
<script language="javascript2.0">
jsversion = 2.0;
</script>
alert(jsversion);

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